Doctor blade mechanism for intaglio printing presses



Oct. 26, 1954 A. P. BAMFORD DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTINGPRESSES Original Filed June o23 1949 l2 Sheets-Sheet l ATTORNEY Oct. 26,1954 A. P. BAMFORD DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSESl2 Sheets-Sheenl 2 Original Filed June 23 1949 NIO NIW

*9% rafa/- A1TORNEY Oct. 26, 1954 A. P. BAMFORD DOCTOR BLADE MECHANISMFOR INTAGLIO PRINTING PRESSES 12 Sheetls-Sheet 3 Original Filed June 25,1949 O Vw. m. MR ww, uw N Nn f vim# ATTORNEY A. P. BAMFORD 2,692,554

l12 sheets-Sheet 4 l NvEN-roR ,4r/af Pamfa/z] .BYf MV nfl/ ATTORNEY Oct.26,v 1954 DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSES originalFiled June 25, 1949 0ct. 26, 1954 A. P. BAMFORD 2,592,554

DOCTOR BLADE MECHNISM FOR INTAGLIO PRINTING PRESSES Original Filed June23, 1949 12 Sheetsrsheet 5 IIIIIIl-IIIIIIilllllllillllll@ Oct. 26, 1954A. P. BAMFORD DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSES 12Sheets-Sheet 6 Original Filed June 23 1949 Oct. 26, 1954 A. P. BAMFORDDOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSES l2 Sheets-Sheet 7Original Filed June 25, 1949 www mW Fmwqwwm lllllll. IIIIIIIII Oct. 26,1954 A. P. BAMFORD DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING `PRESSESl2 Sheets-Sheet 8- Original F'iled June 25 1949 WNW ONM. AW. Im, @1v

OOM. W

A. P. BAMFORD Uct. 26, 1954 DOCTOR BLADE MECH/mism FOR INTAGLIO PRINTINGPRESSES l2 Sheets-Sheet 9 Original Filed June 23 1949 INVENTOR./vV/i//z/f PEG/77 fard BY fr Oct. 26, 1954 A. P. BAMFORD 2,692,554

DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSES Original Filed June25, 1949 12 Sheets-Sheet l0 ATTORNEY Oct. 2 6, 1954 A. P. BAMFORD DOCTORBLADE MECHANISM FOR INTAGLIO PRINTING PRESSES 12 Sheets-Sheet 1lOriginal Filed June 23, 1949 )Wi/zw" 25a/"J ATTO R N E Y Oct. 26, 1954A. P. BAMFORD DOCTOR BLADE MECHANISM FOR INTAGLIO PRINTING PRESSES l2Sheets-Sheet l2 Original Filed J'ue 23 1949 ATTORNEY Patented Oct. 26,1954 STATES TENT Fries DOCTGR BLADE MECHANSM FOR INTAGLIO PRINTINGPRESSES Original application June 23, 1949, Serial No. 100,894), nowPatent No. 2,637,270, dated May 5, 1953. Divided and this 1951, SerialN0. 235,303

(Cl. IOL-157) 5 Claims.

This invention relates generally to intaglio printing presses and thisapplication is a division of my co-pending application Serial No.100,890, led June 23, 1949, and issued May 5, 1953, as

Patent No. 2,637,270. More specifically the invention relates to anintaglio printing press doctor blade and the mounting and operatingmechanism therefor.

As disclosed herein the invention is shown as applied to a multi-colorintaglio printing press consisting of two identical units each of whichis adapted to print a diierent color on a web being fed through thepress. Each unit comprises a printing cylinder, an inlring mechanism bywhich ink is sprayed onto the printing cylinder, a cloctor blademechanism by which the ink is evenly spread over the cylinder, anadjustable pressure roll by which the web is held against the printingcylinder during printing and a drying and exhaust mechanism for dryingthe ink on the i.

web after printing.

The printing cylinder is mounted on a carriage which is sup-ported bywheels riding on a track which facilitate the removal thereof from themachine.

The doctor blade is slidably supported on and extends between the frontand rear frames of the machine and is provided with manual means forvertically adjusting lthe same, with automatic reciprocating meansdriven by the main drive shaft for reciprocating the doctor blade, witha tilting control for varying the angular position of the doctor bladeon the carriage, with adjusting means for shifting the doctor blade toor from the printing cylinder so as to position the same accurately incontact with the surface of said cylinder, and with means for adjustingthe position of the blade in the holder. Means is also provided forallowing the blade to be retracted from the cylinder and to be againbrought into operative position without disturbing the previousadjustments.

The doctor blade mounting and operating mechanism which constitutes thesubject matter of this application is mounted between the side frames ofthe press along one side of the printing cylinder and comprisesgenerally a vertically adinstable slide on which is mounted a reciprocalplatform. The platform carries a tiltable frame on which is adjustablymounted a holder carrying the doctor blade. The platform isreciprocatedL by the main drive shaft of the press through suitabledriving connections.

The principal object of the invention is to provide an improved doctorblade mechanism for inapplication `uly 5,

2 taglio printing presses which is of relatively simple construction, isefficient in operation and can be readily adjusted for operation withdifferent size printing cylinders.

Another object of the invention is to provide a doctor blade mechanismor the above type by which the doctor blade can be quickly and easilymoved out of and back into engagement with the printing cylinder withoutaffecting the setting or adjustment thereof.

Other and more limited objects of the invention will be apparent fromthe following speci,- cation and the accompanying drawings forming apart thereof wherein:

Fig. 1 is a front elevation of a multi-color intaglio press embodyingthe present invention, showing two of the color units and the drivemechanism;

Fig. 2 is a top plan View of the units shown in Fig. 1 with the heatingand drying mechanism of one of the units broken away;

Fig. 3 is a side elevation of a unit taken from the right side of Fig. 1on a larger scale;

Fig. 4 is a side elevation, similar to Fig. 3, partially in section andshowing the printing cylinder carriage partially removed from the pressonto the dolly by which it is transported to and from the press;

Fig. 5 is a vertical section taken on the line 5 5 of Fig. 2;

Fig. 5 is a detail horizontal section taken on line E-i of Fig. 5;

Fig. 7 is a broken detail side elevation of the doctor blade andoperating mechanism therefor;

Fig. 8 is a plan View or the mechanism of Fig, 7 with the press frame insection;

Figs. 9 and l0 are horizontal sections taken along the lines .-Q andIii-lli, respectively, of Fig. 7;

Fig. 11 is a transverse vertical section taken on the line l I--i l IofFig. 7 showing the doctor blade in retracted position;

Fig. l2 is a View similar to Fig. ll showing the doctor blade inoperative position;

Figs. 13, 14, l5 and i6 are transverse sections taken on the lineslli-13, lll-itl, lil--I and ifi- |51 respectively, of Fig. 7;

Fig. 17 is a detail vertical section taken along the line 25--25 of Fig.7; and

Fig. 18 is an enlarged detail section showing the mechanism for clampingthe doctor blade in place.

Referring to Figs. l and 2, the invention is shown as applied to anintaglio printing press composed of two units A and B each of which isadapted to print one color onto a web. Each unit includes a printingcylinder together with inking and control mechanism, a doctor blademechanism, a web-guiding mechanism and a drying chamber. A singledriving means is provided for all of the units which includes powermeans and drives shafts which extend in back of all of the units.

Referring to the figures more in detail, a web I is shown as fed to theunit B over guide rollers, 2, 3, 4, 5 and 6 to a pressure roll 1, thencethrough a drying chamber and over guide rollers 8 and 9 and around theguide roll 2 of the unit A, thence over the correspondingly numberedrolls of the unit A from which it is discharged over a guide roll Isimilar to the roll 2,A thence over a roll in a pulling mechanism I2,whence it is discharged to suitable cutting or stacking mechanism or toa reeling mechanism as desired.

Each drying chamber which is disposed over the top of a printing unitcomprises a heating source I6 which may comprise a steam heating unitand blower mechanism comprising a fan I1 driven by a motor I8 anddischarging air through a port |9 into a zone 2B in which the air isapplied to the top of the web passing through the chamber |5. The zonealso communicates with chambers 2| and 22 which are disposed on thesides of the machine to apply air from the blower |1 to the webs as theyadvance toward and recede from the drying chamber I5. The air from theweb I, containing the vapors which are picked up thereby, is removed;from the chambers 2| and 22 and from the zone 25 by means of a suctionfan 23 communicating with a duct 24 which extends through andcommunicates with each of the drying chambers I5. The vapor-laden airfrom the exhaust fan 23 may be discharged to the outside or to aventilator as desired. The exhaust fan 23 is driven by means of a motor25 through a driving belt 26 which in turn drives a shaft 21 on whichthe exhaust fan is mounted.

The various units are driven by means shown as a main drive motor 28driving a reduction gear train in a housing 29 through a multiple V-belt35. The reduction gear in the housing 29 drives the main drive shaft 3|and a secondary drive shaft 32. The main drive shaft 3| extends alongthe rear of the various units and serves to drive the various printingrolls through means to be described. The secondary drive shaft 32 drivesa reduction gearing mounted in a housing 33 which in turn drives asecondary drive shaft 34 which extends along the rear of the units anddrives the paper feed mechanism not shown. The gear reduction mechanismin the housing 29 includes a clutch of any standard type which isactuated by a clutch lever 36 supported in suitable brackets on apedestal 31. The lever 36 is adapted to control the operation of themain drive shaft 3| and the secondary drive shaft 34 and is mounted in aposition readily accessible to the operator.

Each unit comprises a front frame 40 and a rear frame 4I on which thevarious elements, including the printing cylinder, are mounted. Theframes 40 and 4| are secured on longitudinal channels members 43 and 44,respectively, and are tied together at their tops by cross beams 45. Atop frame comprising front and` rear members 46 and' 41 which aresecured at one end to the top of the front and rear frames 4U and 4| andare supported at their other ends by uprights 48 which are also securedto the longitudinal channel members 43 and 44 is provided. The channelmembers 43 and 44 are tied together by spaced cross members 49 toprovide a rigid unit.

A platform 5|) secured between the front and rear frames 4|) and 4|supports the printing cylinder carriage to be described. The hydrauliccontrol mechanism for the press is mounted in a casing 5| attached tothe front frame piece 4D.

The roll 2 is mounted on suitable brackets 52 carried by the channelmembers 43 and 44. The rolls 3 and 4 are supported by the brackets 53and 54 on the uprights 48. The rolls `8 and 9 are rotatably supportedbetween the longitudinal members 46 and 41. The roll 5 is supported, insuitable bearings, between frames 40 and 4I. Guide roll 6 and pressureroll 1 are mounted on suitable slides and 6| which are supported on thefront and back frames 45 and 4|, respectively, for vertical slidingmovement, so that the rolls 6 and 1 are raised or lowered in unison tobring the pressure roll 1 into printing position or to retract the samefrom the printing cylinder. An ink reservoir generally indicated by thenumeral 63 is detachably connected to the front frame 4Q. The reservoir63 carries a suitable pump mechanism which is driven by a motor 64. Thereservoir also carries a valve housing and connecting means, generallyindicated at 65, by which ink is supplied to and removed from the inkingmechanism.

The running register 66 through which the printing cylinder is drivenfrom the main drive shaft 3|, is mounted in a suitable casing which isattached to the rear frame 4|. The secondary drive shaft 34 extendsthrough this casing but is not connected to any of the mechanism there-The printing cylinder is mounted in a carriage 55 (Fig. 4) whichcomprises a front plate |25 and a back plate |26 joined by side plates|21. Spacer bars |28 are attached on the inside of the side plates |21with their lower ends extending slightly below the bottoms of the sideplates. The spacer bars |28 carry lower side plates |29 which extendnearly to the bottom of the end plates and are joined by a bottom plate|30. A plurality of wheels |3| are attached to the lower side plates |29by means of studs |32. In the forms shown three wheels |3| are spacedalong each side of the carriage.

Back plate |26 is bolted to the lower half |33 of a split bearing block|34. The outer peripheral surfaces of the bearing block |34 iscylindrical and Seats in a cylindrical surface |39 in the rear frame 4|.The bearing block |34 is slidable axially with the carriage into therear frame 4|.

The other end plate |25 of the carriage is bolted to the lower half |56of a rectangular bearing block |51. The bearing block |51 is slidablymounted in a rectangular opening |66 in the front frame 4U and isprovided with flanges |62 and |6I, by which it is positioned in theframe. The front plate |25 is provided with a rectangular ink returnopening registering with an opening in the bearing block |51. The sidesand bottom of the bearing block |51 may be tapered slightly tofacilitate its insertion in the rectangular opening |60 in the frontframe 40.

The bearing blocks |34 and |51 carry antifriction bearings in which theprinting cylinder shaft |65, on which the printing cylinder |66 isremovably secured, is mounted. The shaft |65 is driven from the maindrive shaft 3| through the running register 66. An end registermechanism |67 secured to the bearing block |57 is provided to accuratelyadjust the position of the printing cylinder |66 between the bearingblocks |34 and |57.

The carriage 55 also carries an ink sump which consists of a bottom pan|66 and the vertically adjustable side plates |66. The side plates |69carry ink applicator' tubes |76 which extend parallel to and the fulllength of the printing cylinder |66. Ink is pumped from the reservoir 63through the connector 65 and into the applicator tubes |76 which spraythe ink over the surface of the printing cylinder |66 as it rotates. Theexcess ink falls into the sump pan |68 and drains back into thereservoir 63 through the connector 65.

In order to close the space between the ends of the printing cylinderand the front and back frames 46 and 4|, arcuate shields |75 and |76 areprovided which are bolted, respectively, to end blocks 757 and H34. Theshields |175 and |76 are provided with arcuate lower surfaces which areaccurately machined and overlie the ends of the printing cylinder |66and engage the peripheral surface thereof with a running fit. Of coursethe shields |75 and 76 are changed when different sized cylinders areused. The shields |76 and |76 cooperate with the sliding cover plates 68and 66 to completely enclose the printing cylinder and inking mechanismexcept for the limited area of the printing cylinder which is requiredto be exposed for contact with the web passing around the pressure roll7. The upper edges of the cover plates 66 and 69 are shaped to engagethe shields |75 and |76 which form a limiting stop and are spaced aminute distance from the peripheral surface of the printing roll.

When it is desired to change a printing cylinder the ink reservoir 63 isrst removed and then the printing cylinder carriage 55 and everythingcarried thereby is rolled out onto a dolly |85, as shown in Fig. 4, onwhich the carriage is transported to any desired place. Another carriageand cylinder is then inserted in place.

The doctor blade mechanism is driven from the main drive shaft 3ithrough a worm 466 which meshes with a worm gear 46| on the upper end ofa vertical shaft 462. The gears 466 and 46| are enclosed in a gear case463 bolted to the gear box 465.

Referring now to Figs. 5 and 6, the upper end of the shaft 462 issupported in a bearing 464 in the case 463 and the lower end of theshaft 462 is supported in a bearing 465 mounted in a bracket 466 boltedto the gear case 465. Above the bracket 466 the shaft 462 has keyedthereto a disc having an eccentric cam slot 466 formed therein. Areciprocating slide 476 is provided with a roller 477 which engages thecam slot 468 and is also provided with an elongated slot 472 throughwhich the shaft 462 extends. A cover plate 473 attached to the shaft 462holds the slide 476 in place. The slide 476 is attached to a rod 474which drives the doctor blade mechanism to be described.

The doctor blade actuating mechanism is shown in detail in Figs. '7 tc18 and comprises in general a slide which is adjustable vertically andcarries a platform which is reciprocable axially. The platform carries atilting frame which is tiltable and in turn supports a doctor bladecarrier which is adjustable transversely and carries a doctor blade.This combination provides for adjustment of the doctor blade in alldirections so as to accommodate the same to diiferent size cylinders.

Referring to Figs. '7 18 more in detail, the mechanism comprises avertically slidable member 486 which is slidable between gibs 46| at'Atached to the front and back frames 46 and 4|. The slide 466 is providedat each end with upwardly and downwardly extending projections 462 whichprovide sliding surfaces and serve to hold the slide against lateralmovement.

The slide 486 carries a pair of racks 463 which are disposed at each endof the slide and are engaged by gears 484 carried on a shaft 465 whichis journalled in the front and back frames 46 and 4| and at one end hasa worm gear 466 which is disposed in a recess 467 in the frame 46. Thegear 486 meshes with a worm gear 488 carried by a shaft 486 whichextends to the side of the frame 46 and carries a handle 496 by whichthe rack and slide 486 are vertically adjusted. A set nut 49| isprovided for clamping the shaft 489 in adjusted position.

The slide 466 carries a pair of side plates 464 at each end thereofwhich are bolted to the slide on each side thereof and between which aplatform 465 is mounted for axial reciprocation. The side plates 494 areprovided with grooves 466 in which ride rollers 467 which are carried bythe platform 465. The rollers 467 guide and support the platform in itsaxial reciprocation. At each end of the platform 465 is mounted a block496 having parallel side surfaces 466. Rollers 566 which are mounted onthe top of the side plates 464 and rotate about vertical axes engage theside surfaces 468 of the block 468 for positioning the platform 465laterally and preventing side play as the latter is reciprocated.

The connections for reciprocating the platform 465 are best shown inFigs. '7, 9 and 14. This mechanism comprises the link 474 which ispivoted to an arm 562 carried on a hub 563 which is journalled forrotating movement only in a bearing 564 mounted in a recess in theplatform 56. The hub 565 has a splined opening in which the slidable endof a vertically splined shaft 565 is slidably mounted so that the shaft565 is free to slide axially in the hub 563 but is constrained to rotatetherewith. The upper end of the shaft 565 carries a hub 566 which isrotatably mounted in a bearing 567 carried by a block 566 which isbolted to the slide 466. The hub 566 carries an arm 566 which extendsthrough a slot 576 in the side of the platform 465 and is pivoted to oneend of a link 5| i, the other end of which is pivoted to the platform465 by a vertical pin 5M.

rEhe arrangement is such that reciprocation of the rod 474 rocks thevertical shaft 565 and thereby reciprocates the platform 465.

The blocks 468 also carry pins 5 |5 which rotatably support downwardlyextending ears 5|6 on the ends of a tilting frame 5|7.

At its center the platform 465 carries a pair of upwardly extendingbrackets 5|6 between which are positioned a pair of spaced downwardlyextending legs 548 which are secured to the tilting frame 5|?. A wormgear 526 is mounted between the legs 526 and is supported on a shaft 52|which is disposed in axial alignment with the pins 5|5.

The worm gear 526 meshes with a worm 522 carried by a shaft 523 which isjournalled in suitable bearings in the platform 495 and carries 7 at itsouter end a hand wheel 524 by which the worm is rotated. A lock nut 525is provided for locking the shaft 523 in adjusted position.

The worm wheel 525 is fixed to the legs |9 so that the tilting frame 5I1is tilted about the axis of the pins 515 and shaft 52|y in response toactuation of the hand wheel 524.

A doctor blade carrier 52S slides transversely over the top surface ofthe tilting frame 511, and for clamping the carrier 523 in position apair of plates 529 are slidably mounted in transversely extending Tslots 535 in the tilting frame 5|1 and are secured to screws 53| whichextend through the carrier 528. When the screws 53| are loosened thecarrier 528 may be adjusted transversely. W hen it is properly adjustedit may be clamped by tightening the screws 53|. For accurate lateraladjustmenty of the carrier 528 a pair of feed screws 532 are providedwhich are journalled in the tilting frame 5H' and are provided with handwheels 533 for manual adjustment. The screws 532 extend through feednuts 534 having upwardly extending cylindrical legs 535 which are seatedin recesses 536 formed on the upper side of carrier 528'. Set screws 531are mounted in the carrier 528 to engage the legs 535 of the feed nuts534 for clamping the screws 532 and thereby preventing accidentalturning thereof when the carrier 528 is properly adjusted. The plate 529and screws 53| fit somewhat loosely in the T slots 530 to permitindependent adjustment of the two ends of the carrier 528 so that thecarrier may be adjusted accurately to conform to the peripheral surfaceof the printing cylinder.

A block 545 is mounted on the top of the car- Iier 528 at each endthereof. A doctor blade holder 54| is formed with a bottom channel 542which fits tightly over the blocks 540. The holder 54| is secured to theblocks 54D by means of screws 543. In order to remove the holder 54|from the blocks 545 after the screws 543 have been removed, a pair ofjack screws 544 are provided which are threaded in bushings 545 in theholder 54| and bear against the top of the blocks 545.

A doctor blade 54S and a thin backing plate 549 are adjustably clampedto the holder 54| by means of a clamping plate 550 which is secured bybolts 55| extending through elongated slots in the doctor blade 548 andthe backing plate 545. Hence the doctor blade may be positioned asdesired and clamped by tightening the various clamping bolts 55|. Thisarrangement also permits the doctor blade to be moved outwardly tocompensate for wear. The backing plate 549 is provided for strengtheningpurposes. An ink shield 553, having a rear depending ange 554, issecured to the underside of the clamping plate 55B by means of screws555. The ink shield 553 is adapted to defiect downwardly into the inkpan ink which may pass over the top of the aplicator tube |10 andthereby to prevent the ink from contacting the blade carrier andactuating mechanism.

In order to permit the tilting frame 5l1 and the doctor blade to betilted away from the printing cylinder when desired without disturbingthe accurate adjustment and thus necessitating readjustment thereof, anadjustable stop is provided in the form of a toggle comprising a link555 which is pivoted to a bracket 551 carried by the platform 485 and anadjustable link 558 which is pivoted to a bracket 559 carriedA by thetilting frame 511. The free ends of thelinks 556 and 558 are connectedtogether and the link 558 is provided with a threaded coupling 550 bywhich the length of said link may be adjusted. After the tilting framehas been properly adjusted to position the doctor blade against theprinting cylinder the coupling 565 is adjusted to straighten the toggleand bring the links 555 and 558 to their limiting position, Thereafterthe tilting frame 511 may be retracted about its axis, causing thetoggle to break into the position shown in Fig. 1.3, and in order toagain position the doctor blade against the printing cylinder in itsoriginal adjusted position the tilting frame 5|1 is shifted about itsaxis until the movement thereof is stopped by the tightening of thetoggle links 556 and 558.

From the foregoing it will be apparent to those skilled in this art thatI have provided a very simple and efficient mechanism for accomplishingthe objects of the invention.

It is to be understood that I am not limited to the specificconstruction shown and described herein as various modifications may bemade therein within the scope of the appended claims.

What is claimed is:

l. A doctor blade mechanism adapted to be mounted for cooperation withthe printing cylinder of an intaglio printing press and comprising aframe, an elongated horizontal vertically adjustable slide mounted injibs on opposite sides of said frame, rack and gear means operative tomove said slide up and down and hold said slide in adjusted position, anelongated horizontal platform having an upwardly extending blockadjacent each end thereof; means by which said platform is reciprocallymounted on the top of said slide, said means comprising a pair ofopposed spaced plates secured to slide and extending upwardly therefromadjacent each end of said slidel longtitudinaliy extending grooves insaid plates, rollers carried for rotation about horizontal axes disposedin said grooves, and rollers mounted on said plates for rotation aboutvertical axes engaging the sides of said blocks; drive means operable toreciprocate said platform, an elongated horizontal tiltable framepivotally mounted on the top of said platform for rocking movement abouta longitudinal axis, Worm and worm gear means operative to rock saidframe back and forth and adjustable stop means settabie to hold saidframe in adjusted position, an elongated horizontal doctor blade carrierslidably mounted on top of said tiltable frame for transverse movement,feed screw means operative to adjust the position of said carrierlaterally on said tiltable frame, a doctor blade holder secured to saidcarrier and a doctor blade removably and adjustably mounted in saidholder.

2. In a doctor blade mechanism as set forth in claim 1 a verticalsplined shaft on said frame connected to said drive means and a couplingsplined to said shaft and slidable with said slide connected toreciprocate said platform.

3. A doctor blade mechanism as set forth in claim 1 in which saidadjustable stop means for the tiltable frame comprises a toggle havingadjustable links and connected between said tilting frame and saidplatform.

4. In a doctor blade mechanism as set forth in claim 1, an ink deflectormounted on the underside of said blade holder to deflect ink from themoving parts of said assembly.

5. A doctor blade mechanism adapted to be mounted for cooperation withthe printing cylinder of an intaglio printing press and comprising aframe, an elongated horizontal vertically adjustable slide mounted injibs on opposite sides of said frame, rack and gear means operative tomove said slide up and down and hold said slide in adjusted position, anelongated horizontal platform having an upwardly extending blockadjacent each end thereof; means by which said platform is reciprocallymounted on the top of said slide, said means comprising a pair ofopposed spaced plates secured to slide and extending upwardly therefromadjacent each end of said slide, longitudinally extending grooves inSaid plates, rollers carried for rotation about horizontal axes disposedin said grooves, and rollers mounted on said plates for rotation aboutvertical axes engaging the sides of said blocks; means operative toreciprocate said platform longitudinally of said slide, axially alignedtrunnions carried by the blocks on said platform, an elongatedhorizontal tiltable frame mounted on said trunnions for rockingmovement, means operative to rock said tiltable frame back and forth andto hold said frame in adjusted position, said means comprising acooperating worm and worm gear, one of which is secured to said platformand the other of which is secured to said frame with said Worm gear inaxial alignment with said trunnions, a doctor blade carrier slidablymounted on the top of said tiltable frame for transverse movement, feedscrew means operative to adjust the position of said carrier on saidframe, a doctor blade holder removably secured to said carrier and adoctor blade removably and adjustably mounted in said holder.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date Re. 21,212 Weiss Sept. 19, 1939 2,055,272 Weiss Sept. 22, 19362,115,376 Weiss Apr. 26, 1938 2,178,069 Crafts Oct. 31, 1939 2,292,344Heller Aug. 11, 1942 2,506,011 Caulfield May 2, 1950 2,528,965 MeyerNov. 7, 1950

